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Two pressures are measured for a blood pressure reading 1  : Systolic blood pressure is a measure of blood pressure while the heart is beating. 2  Diastolic pressure is a measure of blood pressure while the heart is relaxed.
The 1st Number: Systolic pressure is the blood pressure when the heart muscle contracts. The 2nd Number: Diastolic pressure is the blood pressure when the heart is relaxed. The BP numbers shown in the chart represent Typical systolic-diastolic pairs. There are many non-typical systolic/diastolic pairs, which I have analyzed statistically at Systolic-Diastolic Pairs.